Consolidated Statements of Shareholders' Equity Statement - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]
Beginning balance (in shares) at Jun. 30, 2018		46,924,000
Beginning balance at Jun. 30, 2018	$ 771,891	$ 469	$ 590,163	$ 179,968	$ 1,291
Issuance of common stock under employee stock incentive plans (in shares)		439,000
Issuance of common stock under employee stock incentive plans	0	$ 5	(5)
Issuance of common stock under employee stock purchase plan (in shares)		51,000
Issuance of common stock under employee stock purchase plan	1,677	$ 1	1,676
Purchased and retirement of common stock (in shares)		(149,000)
Purchase and retirement of common stock	(7,434)	$ (2)	(7,432)
Stock-based compensation	14,836		14,836
Net income	33,971			33,971
Other comprehensive income	(2,559)
Ending balance (in shares) at Mar. 31, 2019		47,265,000
Ending balance at Mar. 31, 2019	812,382	$ 473	599,238	213,939	(1,268)
Beginning balance (in shares) at Dec. 31, 2018		47,249,000
Beginning balance at Dec. 31, 2018	796,076	$ 472	594,670	199,830	1,104
Issuance of common stock under employee stock incentive plans (in shares)		25,000
Issuance of common stock under employee stock incentive plans	1	$ 1
Purchased and retirement of common stock (in shares)		(9,000)
Purchase and retirement of common stock	(501)		(501)
Stock-based compensation	5,069		5,069
Net income	14,109			14,109
Other comprehensive income	(2,372)				(2,372)
Ending balance (in shares) at Mar. 31, 2019		47,265,000
Ending balance at Mar. 31, 2019	$ 812,382	$ 473	599,238	213,939	(1,268)
Beginning balance (in shares) at Jun. 30, 2019	46,924,238	54,248,000
Beginning balance at Jun. 30, 2019	$ 1,284,739	$ 542	1,058,745	226,743	(1,291)
Issuance of common stock under employee stock incentive plans (in shares)		510,000
Issuance of common stock under employee stock incentive plans	3	$ 5	(2)
Issuance of common stock under employee stock purchase plan (in shares)		41,000
Issuance of common stock under employee stock purchase plan	2,393	$ 1	2,392
Purchased and retirement of common stock (in shares)		(187,000)
Purchase and retirement of common stock	(15,683)	$ (2)	(15,681)
Stock-based compensation	19,244		19,244
Net income	58,488			58,488
Other comprehensive income	$ 249				249
Ending balance (in shares) at Mar. 27, 2020	47,265,355	54,612,000
Ending balance at Mar. 27, 2020	$ 1,349,433	$ 546	1,064,698	285,231	(1,042)
Beginning balance (in shares) at Dec. 27, 2019		54,558,000
Beginning balance at Dec. 27, 2019	1,317,056	$ 545	1,056,238	261,666	(1,393)
Issuance of common stock under employee stock incentive plans (in shares)		19,000
Issuance of common stock under employee stock incentive plans	0
Issuance of common stock under employee stock purchase plan (in shares)		41,000
Issuance of common stock under employee stock purchase plan	2,393	$ 1	2,392
Purchased and retirement of common stock (in shares)		(6,000)
Purchase and retirement of common stock	(746)		(746)
Stock-based compensation	6,814		6,814
Net income	23,565			23,565
Other comprehensive income	$ 351				351
Ending balance (in shares) at Mar. 27, 2020	47,265,355	54,612,000
Ending balance at Mar. 27, 2020	$ 1,349,433	$ 546	$ 1,064,698	$ 285,231	$ (1,042)